/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
package javax.swing.plaf.nimbus;

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;
import javax.swing.Painter;


final class DesktopIconPainter extends AbstractRegionPainter {

  //package private integers representing the available states that
  //this painter will paint. These are used when creating a new instance
  //of DesktopIconPainter to determine which region/state is being painted
  //by that instance.
  static final int BACKGROUND_ENABLED = 1;


  private int state; //refers to one of the static final ints above
  private PaintContext ctx;

  //the following 4 variables are reused during the painting code of the layers
  private Path2D path = new Path2D.Float();
  private Rectangle2D rect = new Rectangle2D.Float(0, 0, 0, 0);
  private RoundRectangle2D roundRect = new RoundRectangle2D.Float(0, 0, 0, 0, 0, 0);
  private Ellipse2D ellipse = new Ellipse2D.Float(0, 0, 0, 0);

  //All Colors used for painting are stored here. Ideally, only those colors being used
  //by a particular instance of DesktopIconPainter would be created. For the moment at least,
  //however, all are created for each instance.
  private Color color1 = decodeColor("nimbusBase", 0.02551502f, -0.47885156f, -0.34901965f, 0);
  private Color color2 = decodeColor("nimbusBlueGrey", -0.027777791f, -0.102261856f, 0.20392156f,
      0);
  private Color color3 = decodeColor("nimbusBlueGrey", 0.0f, -0.0682728f, 0.09019607f, 0);
  private Color color4 = decodeColor("nimbusBlueGrey", -0.01111114f, -0.088974595f, 0.16470587f, 0);
  private Color color5 = decodeColor("nimbusBlueGrey", 0.0f, -0.029445238f, -0.019607842f, 0);


  //Array of current component colors, updated in each paint call
  private Object[] componentColors;

  public DesktopIconPainter(PaintContext ctx, int state) {
    super();
    this.state = state;
    this.ctx = ctx;
  }

  @Override
  protected void doPaint(Graphics2D g, JComponent c, int width, int height,
      Object[] extendedCacheKeys) {
    //populate componentColors array with colors calculated in getExtendedCacheKeys call
    componentColors = extendedCacheKeys;
    //generate this entire method. Each state/bg/fg/border combo that has
    //been painted gets its own KEY and paint method.
    switch (state) {
      case BACKGROUND_ENABLED:
        paintBackgroundEnabled(g);
        break;

    }
  }


  @Override
  protected final PaintContext getPaintContext() {
    return ctx;
  }

  private void paintBackgroundEnabled(Graphics2D g) {
    roundRect = decodeRoundRect1();
    g.setPaint(color1);
    g.fill(roundRect);
    roundRect = decodeRoundRect2();
    g.setPaint(decodeGradient1(roundRect));
    g.fill(roundRect);
    rect = decodeRect1();
    g.setPaint(decodeGradient2(rect));
    g.fill(rect);

  }


  private RoundRectangle2D decodeRoundRect1() {
    roundRect.setRoundRect(decodeX(0.4f), //x
        decodeY(0.0f), //y
        decodeX(2.8f) - decodeX(0.4f), //width
        decodeY(2.6f) - decodeY(0.0f), //height
        4.8333335f, 4.8333335f); //rounding
    return roundRect;
  }

  private RoundRectangle2D decodeRoundRect2() {
    roundRect.setRoundRect(decodeX(0.6f), //x
        decodeY(0.2f), //y
        decodeX(2.8f) - decodeX(0.6f), //width
        decodeY(2.4f) - decodeY(0.2f), //height
        3.1f, 3.1f); //rounding
    return roundRect;
  }

  private Rectangle2D decodeRect1() {
    rect.setRect(decodeX(0.8f), //x
        decodeY(0.4f), //y
        decodeX(2.4f) - decodeX(0.8f), //width
        decodeY(2.2f) - decodeY(0.4f)); //height
    return rect;
  }


  private Paint decodeGradient1(Shape s) {
    Rectangle2D bounds = s.getBounds2D();
    float x = (float) bounds.getX();
    float y = (float) bounds.getY();
    float w = (float) bounds.getWidth();
    float h = (float) bounds.getHeight();
    return decodeGradient((0.5f * w) + x, (0.0f * h) + y, (0.5f * w) + x, (1.0f * h) + y,
        new float[]{0.0f, 0.5f, 1.0f},
        new Color[]{color2,
            decodeColor(color2, color3, 0.5f),
            color3});
  }

  private Paint decodeGradient2(Shape s) {
    Rectangle2D bounds = s.getBounds2D();
    float x = (float) bounds.getX();
    float y = (float) bounds.getY();
    float w = (float) bounds.getWidth();
    float h = (float) bounds.getHeight();
    return decodeGradient((0.5f * w) + x, (0.0f * h) + y, (0.5f * w) + x, (1.0f * h) + y,
        new float[]{0.0f, 0.24f, 1.0f},
        new Color[]{color4,
            decodeColor(color4, color5, 0.5f),
            color5});
  }


}
